Installing Biltwell Mini Mufflers onto Lowbrow Customs Shotgun Pipes

Step 1. Locate the middle of the mounting tab on the back of the muffler. Line up the center of the tab on the muffler with the rear bracket mounting holes. Mark the Shotgun Pipe where the cut will be made, make sure to leave enough excess pipe to insert into the muffler flange.

Todd eyeing up where the tabs would meet the mounting bracket.

Todd marking the line he wants to cut on the pipe, make sure to leave enough excess pipe to insert into the muffler flange.

Step 2. Unplug O2 censors.

Todd unplugging the O2 censors from the opposite side of the pipes on the bike.

Step 3. Using both 1/2 inch wrenches remove both nuts and bolts from the mounting tabs at the rear bracket.

Step 4. Remove top pipe from the front cylinder head using a 1/2 inch socket.

Step 5. Use a pipe cutter, angle grinder, or hacksaw to cut the shotgun pipe along the line you marked. If using a hacksaw or angle grinder, it is very important to keep the cut as straight as possible.

Slow and steady wins the race, try and keep it as straight as possible and use a vise if you have one.

Step 6. File off any jagged edges along the cut on the inside and out of the Shotgun Pipe.

Todd filing down any jagged edges.

Step 7. Using a 7/16 inch wrench, make sure the baffles are tight on each muffler.

Step 10. Loosen clamp to allow it to be slipped over the muffler. Then slide muffler on to head pipe.

Todd using a 1/4 inch allen to loosen up the Biltwell Duo Clamp.

Step 11. We chose to stagger the mufflers a little to compensate for the larger diameter of the Duo Muffler Clamps. Locate the middle of the mounting tab on the back of the muffler. Line up the left of the tab on the muffler with the rear bracket mounting holes. Mark the Shotgun Pipe where the cut will be made, make sure to leave enough excess pipe to insert into the muffler flange.

Todd lining up the second Mini Muffler to where he wants to mount it, and marking it to be cut.

Step 18. Note: When attaching mufflers to rear bracket, you may need to add a washer in-between the tab on the muffler and the rear mounting bracket to be sure that the bolt will not come into contact with the muffler when tightened.